1992 Fiscal Year Final Research Report Summary
Preparation and Evolution of Functional Double Oxide Thin Films by Hydrothermal Electrochemical Methods
| Project/Area Number |
03403014
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| Research Category |
Grant-in-Aid for General Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Research Field |
無機工業化学・無機材料工学
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
YOSHIMURA Masahiro Tokyo Inst. Tech.,Research Lab.Eng.Mater, 工業材料研究所, 教授 (10016826)
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| Project Period (FY) |
1991 – 1992
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| Keywords | Hydrothermal Electro-Chemical Method / Hydrothermal / Functional Double Oxide / Thin Film / Supercritical Fluid / Barium Titanate / Lead Titanate / Calcium Titanate |
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| Research Abstract |
Hydrothermal synthesis, where high pressure and high temperature aqueous solutions are reactive solvents or reagents, has been applied to ceramics: inorganic compounds and/or their composites. In particular,in the present study, functional double oxides such perovskite-type oxides as BaTiO_3 could be prepared as thin films on Ti metal substrate through in sim reactions between the substrate and the solvent at relatively low temperatures of 120-200ﾟC under saturation vapor pressure of 0.2-2 MPa for 1 h. PbTiO_3,SrTiO_3 and CaTiO_3 also could be prepared as films by this method. Similarly, BaNbO_3,LiNbO_3 and Ba_5Nb_4O_<15> on Nb substrate, and LiTaO_3 on ta substrate have been synthesized. Polycrystalline tetragonal BaTiO_3 films were prepared on Ti substrate at 400-700ﾟC under hydrothermal conditions. Epitaxial growth of BaTiO_3 on SrTiO_3 substrate has been succeeded. These products were confirmed through X-ray diffraction, scanning electron microscope and/or Raman spectroscopy. Alkaline earth titanate films could be prepared on TiAl that is expected as one of future high temperature materials if appropriate anti-oxidative coating could be prepared on the TiAl substrate. It was observed that CaTiO_3 films could retard the oxidation of TiAl by cyclic heating at 900ﾟC in air.
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